A conducting bar of length L is free to slide on two parallel conducting rails as shown in figure-Two resistors R1 and R2 are connected across the ends of the rails- There is a uniform magnetic field B pointing into the page- An external agent pulls the bar to the left at a constant speed v- The correct statement about the directions of induced currents I1 and I2 flowing through R1 and R2 respectively is-

227

You visited us 227 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Analysis of Force Equation

A conducting ...

Question

A conducting bar of length $L$ is free to slide on two parallel conducting rails as shown in figure.

Two resistors $R_{1}$ and $R_{2}$ are connected across the ends of the rails. There is a uniform magnetic field $\to B$ pointing into the page. An external agent pulls the bar to the left at a constant speed $v$ . The correct statement about the directions of induced currents $I_{1}$ and $I_{2}$ flowing through $R_{1}$ and $R_{2}$ respectively is:

I_{1}

is in clockwise direction and

I_{2}

is in anticlockwise direction

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both

I_{1}

and

I_{2}

are in clockwise direction

No worries! We‘ve got your back. Try BYJU‘S free classes today!

I_{1}

is in anticlockwise direction and

I_{2}

is in clockwise direction

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both

I_{1}

and

I_{2}

are in anticlockwise directon

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $I_{1}$ is in clockwise direction and $I_{2}$ is in anticlockwise direction

When the bar slides, area of loop 1 decreases and that of loop 2 increases. Magnetic flux decreases in 1 and increases in 2. Therefore, according to Lenz's law, induced emf and current resist this change. As a result, magnetic flux through 1 should increase and through 2 should decrease. So, $I_{1}$ would be clockwise and $I_{2}$ anticlockwise.
Hence option (a) is correct.

Suggest Corrections

Similar questions

Q. Two parallel, conducting rails

1

and

2

are kept perpendicular to a uniform magnetic field

(B)

. The rails are at seperation

l

and are joined at their ends by a resistance

R

. A conducting bar

A B

is placed on the rails making

60^{\circ}

with them. The bar is pulled with a velocity

v

parallel to the rails. Find the current in the resistance

R

Q. Two parallel vertical metallic rails AB and CD are separated by 1m. They are connected at the two ends by resistances

R_{1}

and

R_{2}

as shown. A horizontal metallic bar PQ of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is uniform horizontal magnetic field of 0.6T perpendicular to plane of the rails. It is observed that when the terminal velocity attained, the power dissipated in

R_{1}

and

R_{2}

are 0.76 W and 1.2 W respectively. Find the terminal velocity of bar in

\frac{m}{s}

{(g = 9.8 \frac{m}{s})}^{2}

Q. Two straight conducting rails from a right angle where their ends are joined. A conducting bar in contact with the rails starts at the vertex at time t=0 and moves with constant velocity v along them as shown in figure. magnetic fields

\to B

is directed into the page. The induced emf in the circuit at any time is proportional to

Q. A conducting bar of mass m and length l moves on two frictionless parallel rails in the presence of a constant uniform magnetic field of magnitude B directed into the page as shown in the figure. The bar is given an initial velocity

v_{0}

towards the right at

t = 0

. Then the

Q. A conducting rod length

l

is moved at constant velocity

v_{0}

on two parallel, conducting, smooth, fixed rails, which are placed in a uniform constant magnetic field

B

perpendicular to the plane of the rails as shown in figure. A resistance

R

is connected between the two ends of the rail. Then which of the following is/are correct?

Join BYJU'S Learning Program